United Airlines really wants to avoid another customer service disaster. And make flying its airline better in the process.

The airline said it is making 10 changes to prevent a repeat of what happened to Dr. David Dao, who was dragged from a flight because United needed extra seats for commuting crew members. Video of the April 9 incident quickly went viral. Dao suffered a concussion and two missing teeth.

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United had promised a review by April 30 of what happened aboard flight 3411 and changes to reduce involuntary denial of boarding or bumping "to as close to zero as possible."

"Our review shows that many things went wrong that day, but the headline is clear: our policies got in the way of our values and procedures interfered in doing what's right," said United chief executive Oscar Munoz in a statement.

United acknowledged four failures that day.

First, it shouldn't have called law enforcement when a security of safety issue didn't exist.

Second, it failed when rebooking the crew on an already packed and boarded flight.

Third, it failed to lure passengers voluntarily with sufficient compensation. Its agents didn't have the authority to offer more or or find other ways to get passengers to their destination.

Lastly, United didn't prepare its employees for situations like the one with Dr. Dao.

So United came up with 10 policy changes and initiatives to reduce bumping and improve customer service. Some have already been implemented, and others will be rolled out soon.

What's changing at United

1. United won't use law enforcement unless there's a safety or security issue -- it won't call the cops simply to enforce its own policies.

2. Boarded passengers won't be asked to give up their seats involuntarily unless there's a safety or security issue.

3. United is increasing compensation to $10,000 for voluntarily giving up your seat.

4. A "customer solutions team" is being created to assist gate agents to get fliers to their destinations. The team will also help crews find alternatives to displacing passengers.

5. Traveling crew members must be booked at least 60 minutes before departure.

6. United will add new annual training for its agents "that will equip them to handle the most difficult of situations." This begins in August.

7. United will ask passengers during automated check-in or on its app if they're interested in giving up their seat in exchange for compensation.

8. It is cutting back overbooking for last-of-the-day flights, like flight 3411 -- or flights that historically had few passengers voluntarily give up seats.

9. Using a new app, flight attendants and gate agents can proactively dole out miles or other compensation "when a disservice occurs."

10. The airline is cutting the red tape for lost bags. If a bag goes permanently missing, the airline is adopting a "no-questions-asked" policy. United will pay $1,500 for the bag and its contents.